在CLLocationDistance中添加一些计算

Question

这是我的问题，我可以在控制台双值(也就是距离)中打印，但我不能取一个双值并将距离添加到一个表视图中作为示例。

if previousLocation == nil {
            previousLocation = locations.first
        } else {
            guard let latest = locations.first else { return }
            let distanceInMeters = previousLocation?.distance(from: latest) ?? 0
            print("Distance in meters: \(distanceInMeters)")
            guard var unwrappedPaceNumber = paceNumber.first else { return }
            
            let total = unwrappedPaceNumber += "\(distanceInMeters)"
            paceNumber[0] = "\(total)"
            tableView.reloadData()
            
            previousLocation = latest
        }

Answer 1

如果这能帮上忙的话，我最终就会变成那样

 if previousLocation == nil {
            previousLocation = locations.first
        } else {
            guard let latest = locations.first else { return }
            let distanceInMeters = previousLocation?.distance(from: latest) ?? 0
            var distanceRounded = distanceInMeters.rounded()
            print("Distance in meters: \(distanceRounded)")
            let unwrappedPaceNumber = paceNumber[0]
            distanceRounded += Double(unwrappedPaceNumber)!
            paceNumber[0] = "\(distanceRounded)"
            print(paceNumber[0])
            tableView.reloadData()

            previousLocation = latest
        }